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  2. Optical telegraph - Wikipedia

    en.wikipedia.org/wiki/Optical_telegraph

    The operators would move the semaphore arms to successive positions to spell out text messages in semaphore code, and the people in the next tower would read them. An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals (a form of optical communication ).

  3. Flag semaphore - Wikipedia

    en.wikipedia.org/wiki/Flag_semaphore

    A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005). Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and - φέρω (-phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands.

  4. International Code of Signals - Wikipedia

    en.wikipedia.org/wiki/International_Code_of_Signals

    The code also covers procedural aspects (how to initiate a call, the format of a message, how to format date and time, etc.), how naval ships (which usually use their own codes) indicate that they are using the ICS (by flying the code pennant), use in radiotelephony (use of the spoken word "Interco"), and various other matters (such as how an ...

  5. Semaphore - Wikipedia

    en.wikipedia.org/wiki/Semaphore

    Semaphore (lit. ' apparatus for signalling '; from Ancient Greek σῆμα (sêma) 'mark, sign, token' and Greek -φόρος (-phóros) 'bearer, carrier') [1] is the use of an apparatus to create a visual signal transmitted over distance. [2] [3] A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms.

  6. Flag signals - Wikipedia

    en.wikipedia.org/wiki/Flag_signals

    Myer's 1866 manual also includes a 3-element fixed length code using four elements, and the 1872 manual has a 3-element fixed length code using three elements. [10] [11] There is little sign that these codes were widely used. The 1872 manual includes a variable length code using four elements which Myer says was used by the Army, but is ...

  7. North American railroad signaling - Wikipedia

    en.wikipedia.org/wiki/North_American_railroad...

    The US and Canada departed from UK practice wherein a semaphore blade is devoted to each route (Route Signaling). General North American practice is to group routes by speeds and use a single blade for, say, "medium speed" regardless of the number of routes involved (Speed Signaling). The primary exception to this situation is in the field of ...

  8. Trafficators - Wikipedia

    en.wikipedia.org/wiki/Trafficators

    Trafficators are semaphore signals which, when operated, protrude from the bodywork of a motor vehicle to indicate its intention to turn in the direction indicated by the pointing signal. Trafficators are often located at the door pillar .

  9. Chappe telegraph - Wikipedia

    en.wikipedia.org/wiki/Chappe_telegraph

    For each word or expression, two symbols were transmitted; the first indicated the page number for the word or expression, and the second indicated the word's position on the code book's page. [8] For example, as shown in the photo on the right, the code for "ignorance" would be (50, 87) since the word is on page 50 in position 87.

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